Playing oc_harvest. Turned on mp_friendlyfire. Planted slam at our plants. Blew it up when my friend was close. They landed like this:

Note: If you're wondering why I had an RPG, that's because I actually gave myself every weapon and was already killing my friend a ton beforehand and afterhand.

Edit: Just read some of the comments on the last page. I see some of you are noting that OC servers and whatnot are not as full popular as they are now. People just forget after long periods of the same thing. I'm sure that after the next update, servers will be flooded with players again. If many players saw it before, they will then as well!